Jarring mechanism for screening or separating machines.



(CD Q T. J5. STURTEVANT.

JARRING MECHANPSM FOR SQREENlNG OR SEPARATING MACHINES.

APPLICATION FILED JAN. 10, 19H. 190

Patented June 12, 191?.

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arranged below the screens.

UNITED STATS PATENT @FFTCE STURTEVAN '1 MILL COMPAN Y, A conrona'rron or MAINE.

JAB/RING MECHANISM FOR SCREENING OR SEPARA'IING MACHINES.

Specification 0 Application filed Januar To all whom it may concern:

Be it known that I, THOMAS J. SIFRTE- V'iANT, a citizen of the United States, residing at VVellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in J arring l\lechanisms for Screening or Separating Machines, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to that class of inclined screening or separating machines in which the screens are percussivcly jarred or vibrated, and the invention relates more particularly to certain improvements in the machine of the Bell and Sturtevant Patent No. 923,108, dated May 25, 1909, in which the screens are jarred from hammers or strikers The present improvement has special reference to the hammer or vibrating mechanism for percussively jarring the fine screens of the separators.

In accordance with the present invention the fine screen is percussively jarred from below, by means of gravity-impelled hammers depressed by tappets and preferably formed in two sections so that they may perform their action efficiently without checking the vibrations of the screens to which their action is imparted through impact bars. a

The accompanying drawing is a detail view illustrating one of the improved jarring devices, a plurality of which will of course be used in each separating machine for jarring the screen or screens.

Referring to the drawing, 12 denotes the bottom of the screen box or casing to which are attached hangers 13 and 14. Pivoted on a. pin 15 sustained by hanger 13 is a gravity hammer or striker consisting of the parts 16 and- 17 jointed together by a pin 18, the part 16 being provided at its outer or free end with a weight 19. The shaft 20, which, in practice, will be journaled in a plurality of hangers 14, carries tappets 21 arranged to engage the adjacent curved end of the hammer part 17 and which hammer part, after being depressed by one of the tappets 21, will be forced upward by the weight 19 into contact with an impact bar or pin 22 to force the same upward into contact with an impact block 23 attached to a transverse f Letters Patent.

Patented June 112, 1917. Serial no. 141,587.

protection plate 24.- mounted at the lowerside of the wire mesh screen 25.

Secured to the casing part 12 is a tubular stop 26 provided with a flange by which it is attached to said casing part. and the impact bar is provided with tubular weight 27 adapted to rest on said stop to form a dustlock. as also to hasten and limit the downward movement of said impart bar after the same has been forced upward by a blow from the hammer element 17.

The hanger 13 is provided with a cushioning stop 28 (preferably consisting of a block of wood) on which the weight 19 of the hammer strikes when the hammer is released from one of the tappcts 21; but owing to the jointed connection at 18 of the two hammer parts the hammer part 17 will be free to move upward, after the'hammer part 15 is stopped, so as to strike the impact pin 22 and force the same into contact with the impact block 28; and the said hammer part 17 will then fall 10k to the position shown in the drawing in which a shoulder 29 on the part 1'7 will be in contact with a shoulder 30 on the part 16.

By constructing the gravity-impelled hammers in two parts jointed together, as shown, the parts 17 may act inde 'iemlently of the parts 16 so that said parts 17 may quickly retire after having delivered their blows, and thus avoid checking the vibrations imparted to the screen or screens.

From the foregoing it will be understood that when the machine is in operation the screen 25 will be percussively jarred at iutervals by means of repeated blows from the hammer parts 17 which will be forced up ward, after having been depressed by the tappets 21, by the gravity-inipelled or weighted hammer parts 16. It will also be understood, as heretofore indicated, that a plurality of these hammer mechanisms will be provided in each machine for jarring the screen or screens, as is common in vibrating separators of the class to which this invention relates.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below, and impact bars interposed between said hammers and said screen and t rough which the force of the blows of said hammers are delivered to said screen.

2. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below and each formed in two parts jointed together, and impact bars interposed between said hammers and said screen and through which the force of the blows of said hammers are delivered to said screen.

3. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below, im-

pact bars interposed between said hammers and said screen and through which the force of the blows of said hammers are delivered to said screen, and revolving tappets for de pressing the striking parts of said hammers.

4. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below and each formed in two parts jointed together, impact bars interposed between said hammers and said screen and through which the force of the blows of said hammers are delivered to said screen, and revolving tappets for depressing the striking parts of said hammers.

5. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below and each formed in two parts jointed together, and one of which parts is weighted, impact bars interposed between said hammers and said screen and through which the force of the blows to said hammers are delivered to said screen, and stops for limiting the downward movements of said weighted parts of said hammers.

6. In a separator, the combination with a screen to be percussively arred, of gravityimpelled hammers acting from below and each formed in two parts jointed together,

and one of which parts is weighted, impact stops for limiting the downward movements of the said weighted parts of said hammers.

7. In a separator, the combination with a screen to be percussively jarred, of gravityimpelled hammers acting from below and each formed in two parts jointed together, and one of which parts is weighted, weighted impact bars interposed between said hammers and said screen and through which the force of the blows of said hammers are delivered to said screen, and stops for limiting the downward movements of the said weighted parts of said hammers.

8. In a separator, the combination with a screen to be pereussively jarred, of gravityimpelled hammers acting from below and each formed in two parts jointed together, and one of which parts is weighted, weighted impact bars interposed between said hammers and said screen and through which the force of the blows of said hammers are delivered to said screen, revolving tappets for depressing the striking parts or said hammers, and stops for limiting the downward movements of the said weighted parts of said hammers.

In testimony whereof I afiix my signature. 

